package com.mall.generator.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.mall.common.constant.Constants;
import com.mall.common.constant.GenConstants;
import com.mall.common.core.text.Convert;
import com.mall.common.exception.BusinessException;
import com.mall.common.utils.StringUtils;
import com.mall.generator.domain.GenTable;
import com.mall.generator.domain.GenTableColumn;
import com.mall.generator.mapper.GenTableColumnMapper;
import com.mall.generator.mapper.GenTableMapper;
import com.mall.generator.service.IGenTableService;
import com.mall.generator.util.GenUtils;
import com.mall.generator.util.VelocityInitializer;
import com.mall.generator.util.VelocityUtils;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.StringWriter;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.apache.commons.io.IOUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * 业务 服务层实现
 * Created by zhonglin on 2020/4/8.
 */
@Service
public class GenTableServiceImpl
    implements IGenTableService {

  private static final Logger log = LoggerFactory.getLogger(GenTableServiceImpl.class);

  @Autowired
  private GenTableMapper genTableMapper;

  @Autowired
  private GenTableColumnMapper genTableColumnMapper;

  /**
   * 查询业务信息
   *
   * @param id 业务ID
   *
   * @return 业务信息
   */
  @Override
  public GenTable selectGenTableById(Long id) {

    GenTable genTable = genTableMapper.selectGenTableById(id);
    setTableFromOptions(genTable);
    return genTable;
  }

  /**
   * 查询业务列表
   *
   * @param genTable 业务信息
   *
   * @return 业务集合
   */
  @Override
  public List<GenTable> selectGenTableList(GenTable genTable) {

    return genTableMapper.selectGenTableList(genTable);
  }

  /**
   * 查询据库列表
   *
   * @param genTable 业务信息
   *
   * @return 数据库表集合
   */
  public List<GenTable> selectDbTableList(GenTable genTable) {

    return genTableMapper.selectDbTableList(genTable);
  }

  /**
   * 查询据库列表
   *
   * @param tableNames 表名称组
   *
   * @return 数据库表集合
   */
  public List<GenTable> selectDbTableListByNames(String[] tableNames) {

    return genTableMapper.selectDbTableListByNames(tableNames);
  }

  /**
   * 修改业务
   *
   * @param genTable 业务信息
   *
   * @return 结果
   */
  @Override
  @Transactional
  public void updateGenTable(GenTable genTable) {

    String options = JSON.toJSONString(genTable.getParams());
    genTable.setOptions(options);
    int row = genTableMapper.updateGenTable(genTable);
    if (row > 0) {
      for (GenTableColumn cenTableColumn : genTable.getColumns()) {
        genTableColumnMapper.updateGenTableColumn(cenTableColumn);
      }
    }
  }

  /**
   * 删除业务对象
   *
   * @param ids 需要删除的数据ID
   *
   * @return 结果
   */
  @Override
  @Transactional
  public void deleteGenTableByIds(String ids) {

    genTableMapper.deleteGenTableByIds(Convert.toLongArray(ids));
    genTableColumnMapper.deleteGenTableColumnByIds(Convert.toLongArray(ids));
  }

  /**
   * 导入表结构
   *
   * @param tableList 导入表列表
   * @param operName  操作人员
   */
  @Override
  @Transactional
  public void importGenTable(List<GenTable> tableList,
                             String operName) {

    for (GenTable table : tableList) {
      try {
        String tableName = table.getTableName();
        GenUtils.initTable(table, operName);
        int row = genTableMapper.insertGenTable(table);
        if (row > 0) {
          // 保存列信息
          List<GenTableColumn> genTableColumns = genTableColumnMapper.selectDbTableColumnsByName(tableName);
          for (GenTableColumn column : genTableColumns) {
            GenUtils.initColumnField(column, table);
            genTableColumnMapper.insertGenTableColumn(column);
          }
        }
      } catch (Exception e) {
        log.error("表名 " + table.getTableName() + " 导入失败：", e);
      }
    }
  }

  /**
   * 预览代码
   *
   * @param tableId 表编号
   *
   * @return 预览数据列表
   */
  public Map<String, String> previewCode(Long tableId) {

    Map<String, String> dataMap = new LinkedHashMap<>();
    // 查询表信息
    GenTable table = genTableMapper.selectGenTableById(tableId);
    // 查询列信息
    List<GenTableColumn> columns = table.getColumns();
    setPkColumn(table, columns);
    VelocityInitializer.initVelocity();

    VelocityContext context = VelocityUtils.prepareContext(table);

    // 获取模板列表
    List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
    for (String template : templates) {
      // 渲染模板
      StringWriter sw  = new StringWriter();
      Template     tpl = Velocity.getTemplate(template, Constants.UTF8);
      tpl.merge(context, sw);
      dataMap.put(template, sw.toString());
    }
    return dataMap;
  }

  /**
   * 生成代码
   *
   * @param tableName 表名称
   *
   * @return 数据
   */
  @Override
  public byte[] generatorCode(String tableName) {

    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    ZipOutputStream       zip          = new ZipOutputStream(outputStream);
    generatorCode(tableName, zip);
    IOUtils.closeQuietly(zip);
    return outputStream.toByteArray();
  }

  /**
   * 批量生成代码
   *
   * @param tableNames 表数组
   *
   * @return 数据
   */
  @Override
  public byte[] generatorCode(String[] tableNames) {

    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    ZipOutputStream       zip          = new ZipOutputStream(outputStream);
    for (String tableName : tableNames) {
      generatorCode(tableName, zip);
    }
    IOUtils.closeQuietly(zip);
    return outputStream.toByteArray();
  }

  /**
   * 查询表信息并生成代码
   */
  private void generatorCode(String tableName,
                             ZipOutputStream zip) {
    // 查询表信息
    GenTable table = genTableMapper.selectGenTableByName(tableName);
    // 查询列信息
    List<GenTableColumn> columns = table.getColumns();
    setPkColumn(table, columns);

    VelocityInitializer.initVelocity();

    VelocityContext context = VelocityUtils.prepareContext(table);

    // 获取模板列表
    List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
    for (String template : templates) {
      // 渲染模板
      StringWriter sw  = new StringWriter();
      Template     tpl = Velocity.getTemplate(template, Constants.UTF8);
      tpl.merge(context, sw);
      try {
        // 添加到zip
        zip.putNextEntry(new ZipEntry(VelocityUtils.getFileName(template, table)));
        IOUtils.write(sw.toString(), zip, Constants.UTF8);
        IOUtils.closeQuietly(sw);
        zip.flush();
        zip.closeEntry();
      } catch (IOException e) {
        log.error("渲染模板失败，表名：" + table.getTableName(), e);
      }
    }
  }

  /**
   * 修改保存参数校验
   *
   * @param genTable 业务信息
   */
  public void validateEdit(GenTable genTable) {

    if (GenConstants.TPL_TREE.equals(genTable.getTplCategory())) {
      String     options   = JSON.toJSONString(genTable.getParams());
      JSONObject paramsObj = JSONObject.parseObject(options);
      if (StringUtils.isEmpty(paramsObj.getString(GenConstants.TREE_CODE))) {
        throw new BusinessException("树编码字段不能为空");
      } else if (StringUtils.isEmpty(paramsObj.getString(GenConstants.TREE_PARENT_CODE))) {
        throw new BusinessException("树父编码字段不能为空");
      } else if (StringUtils.isEmpty(paramsObj.getString(GenConstants.TREE_NAME))) {
        throw new BusinessException("树名称字段不能为空");
      }
    }
  }

  /**
   * 设置主键列信息
   *
   * @param genTable 业务表信息
   * @param columns  业务字段列表
   */
  public void setPkColumn(GenTable table,
                          List<GenTableColumn> columns) {

    for (GenTableColumn column : columns) {
      if (column.isPk()) {
        table.setPkColumn(column);
        break;
      }
    }
    if (StringUtils.isNull(table.getPkColumn())) {
      table.setPkColumn(columns.get(0));
    }
  }

  /**
   * 设置代码生成其他选项值
   *
   * @param genTable 设置后的生成对象
   */
  public void setTableFromOptions(GenTable genTable) {

    JSONObject paramsObj = JSONObject.parseObject(genTable.getOptions());
    if (StringUtils.isNotNull(paramsObj)) {
      String treeCode       = paramsObj.getString(GenConstants.TREE_CODE);
      String treeParentCode = paramsObj.getString(GenConstants.TREE_PARENT_CODE);
      String treeName       = paramsObj.getString(GenConstants.TREE_NAME);
      genTable.setTreeCode(treeCode);
      genTable.setTreeParentCode(treeParentCode);
      genTable.setTreeName(treeName);
    }
  }

}